when i start my car warm it cranks fine, starts but then stalls and when i restart it its fine? What gives anyone know what sensor/ issue i have. They is no CEL and starts ok cold. It runs fine after starting. The car only has 20k miles on it and the maintence is all done. I cleaned the throttlbody just in case but it didnt help.

 

Oh, and i havent touch a thing in the engine recently to cause a issue. The tune is still stock.

 

ok... so sounds like once the car is warmed up it's ok? Only idles for **** when it's cold?

So it's a problem when running in Open Loop
there are no SES lights right? (can you scan to make sure there is definetly nothing... maybe codes that don't set a light)
MAF, TPS and IAT are all plugged in?
Engine Sensor Fuse isn't blown?

The car runs in open loop when you first start the car sice hte O2s aren't warmed up...

sensors it needs for this are MAF, TPS, MAP, IAT, ECT, and engine speed... so check the connections at these sensors

once it's running ok have you tried going WOT or have you not wanted to chance it?

 

Yeah it runs great i had it WOT and drove it far. The cold start is ok its when i start it hot it wont run until i restart or and hit the throttle. Its strange cause it runs perfect after that. It has no SES but i will have someone scan it anyway to check.

 

I have been searching through the threads to see if anyone else is having a stalling issue on a basically stock car. My 1999 Z28 will stall or will idle like **** after the car sits for 5 hours or more. It doesn't do this everyday however. This happens every other day or every couple days. The car will also surge as well then stall when I come to a stop sign. I know its probably a sensor issue but Im not sure which sensor. I read another thread about stalling in here but all those guys changed had H/C or a different TB/Intake. Mine is stock.